1345725637 has 4 divisors (see below), whose sum is σ = 1345877676. Its totient is φ = 1345573600.

The previous prime is 1345725617. The next prime is 1345725649. The reversal of 1345725637 is 7365275431.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1090716676 + 255008961 = 33026^2 + 15969^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1345725637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1345725593 and 1345725602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1345725617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61864 + ... + 80737.

It is an arithmetic number, because the mean of its divisors is an integer number (336469419).

Almost surely, 2^1345725637 is an apocalyptic number.

It is an amenable number.

1345725637 is a deficient number, since it is larger than the sum of its proper divisors (152039).

1345725637 is an equidigital number, since it uses as much as digits as its factorization.

1345725637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152038.

The product of its digits is 529200, while the sum is 43.

The square root of 1345725637 is about 36684.1333140092. The cubic root of 1345725637 is about 1104.0417802246.

The spelling of 1345725637 in words is "one billion, three hundred forty-five million, seven hundred twenty-five thousand, six hundred thirty-seven".